We don't have any synonyms for issuant yet.
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Definition of issuant:
(adj) :
(heraldry) Issuing or emerging from something, especially from the bottom (or a division) of the field or chief, or from an ordinary.
(adj) :
(heraldry, by extension, of an animal) Having only the upper half depicted, especially if because it is issuing from something (such as a division of the field). (Compare naissant.)
(adj) :
(archaic) Issuing, emerging.